Fiber Distributed Data Interface (FDDI)
The FDDI specifications define a family of standards for 100 Mbps fiber optic LANs that provide the physical layers and media access control sublayer of the data link layer, as defined by the ISO/OSI Model.
IP-FDDI defines the encapsulating of IP datagrams and ARP requests and replies in FDDI frames.
- 2048 for IP
- 2054 for ARP
Typically, the MTU is set to 4352.
Mapping of 32-bit internet addresses to 48-bit FDDI addresses is done by the ARP dynamic discovery procedure. The broadcast internet addresses (whose <host address> is set to all ones) are mapped to the broadcast FDDI addresses (all ones).
IP datagrams are transmitted as a series of 8-bit bytes using the usual TCP/IP transmission order called big-endian or network byte order.
For more information about FDDI architecture, see LAN Concepts and Products.